46 



Var. /3. Pallida, ared dorsali vel posteriori lunuldque violaceis; lineis 

 concentricis antici lamellatis, alibi rotundatis irregularibus, ru- 

 garum formam referentibus ; spinis distantibus longissimis. 



This variety, of which Mr. Cuming possesses a specimen with the 

 lower spines an inch and a half long, grows to a large size. It was 

 dredged up at Tumbez, in Peru, from soft mud at a depth of five 

 fathoms. 



Var. y. Violacea ; antici et ad umbones sublamellosa, alibi Icevis ; 

 spinis valde distantibus, crassiusculis, medtocribus. 



This variety, which is almost entirely of a violet colour excepting 

 the two white streaks which mark the line of the spines in each valve, 

 and some white about the neighbourhood of the lower part of the 

 anterior border, grows also to a large size. It is smooth with the 

 exception of a few concentric lines at the umbones and a few lamella; 

 towards the anterior border. The spines are distant, indeed in the 

 specimen before me there are hardly any in the place where the in- 

 terior rows usually are, there being but one on one side and none on 

 the other, with the exception of a few towards the umbones on both 

 sides. The outer spines, as well as the inner one, are thick and 

 strong but comparatively short, the longest being hardly seven eighths 

 of an inch long in a specimen of about the same size as that from 

 which the description of variety /3 was taken. Var. y was dredged 

 up from sandy mud at a depth of seven fathoms at San Bias in the 

 gulf of California. 



There are many gradations of colour, &c. between the varieties. 

 I possess a specimen of variety ji very nearly white, with the ex- 

 ception of the lunule. All the varieties are subject to have the spines, 

 or at least some of thera, tortuous. — W. J. B. 



Cytherea vulnerata. Cyth. testd subglobosd, lineis concentricis 

 creberrimis leevibus, albente fasciis angustis piirpureo-sanguineis 

 hinc et hinc ornatd; lunuld et aredposticd sub-atropui-pureis ; limbo 

 ventrali rubra, intiis subcrenulato ; epidermide sub/used ; intics 

 albd subroseo suffusd : long. \6, lat. 09, alt. I 4 poll. 

 Hab. in America Centrali. (Real Llejos.) 



The ruddy lines which occasionally gird this whitish shell, and its 

 red border, give this species a pleasing appearance. It was dredged 

 up from sandy mud at a depth of six fathoms. — W. J. B. 



Cytherea planulata, var. sufFusa. Cyth. planulata, testd <squi- 

 later ali, trigond, radiis omnino suffusis ; latere postico clauso. 



Hab. ad Salango. 



This differs from Cyth. planulata, (Zool. Journ., V. p. 48,) in being 

 more equilateral, rather more gibbose, in having the coloured rays 

 spread all over the shell, and in being closed posteriorly. The an- 

 terior side in Cyth. planulata is the longer. 



Found In sandy mud at a depth of nine fathoms. — G. B. S. 



Cytbkbea ARGENTINA. Cyth. tcstd subtrigoud, Itevi, albd, subaqui- 

 laterali, latere antico paullh breviore, postico subacuminato ; mar- 

 gine dorsali postico rectiusculo, declivi, ventrali rotundato ; epi- 

 dermide tenui, corned, extus velutind, albd, quasi argentatd, indutd . 

 long. -2-5, lat. 1-4, alt. 2-1 poll. 



